The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 2020
Filed:
Feb. 18, 2016
Kabushiki Kaisha Toshiba, Minato-ku, Tokyo, JP;
Toshiba Solutions Corporation, Kawasaki-shi, Kanagawa, JP;
Masakazu Hattori, Inagi Tokyo, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
TOSHIBA SOLUTIONS CORPORATION, Kawasaki-Shi, JP;
Abstract
According to an embodiment, a database system includes nodes and a management device. The management device includes first and second assigning units. Depending on change in state of each node, the first assigning unit assigns a first node storing data pieces and receiving an access request to the data pieces, and assigns a second node serving as a backup node, and instructs each node to perform operations according to assignment. Depending on state of nodes and change in assignment state, the second assigning unit assigns a third node as a candidate node serving as the first node, and instructs each node to make preparation for causing the third node to operate as the first node. Each node sends, to the third node, a snapshot of the data pieces at the first time point and an operation log according to the access request at and after the first time point.